Time Mark 2581 Data Sheet
MODEL 2581
L1
L2
L3
M
M
M
M
MOTOR
O/L's
START
STOP
CONTROL
VOLTAGE
MODEL
2581
M
0.75"
.25" dia.
typ.
.25" male
quick connect
2.0"
2.0"
1.38"
TIME MARK is a division of
3-Phase Monitor
Detects Phase Loss, Low Voltage
and Phase Reversal
Encapsulated Circuitry
LED Status Indicator
1/4” Quick-connect Terminals
DESCRIPTION
The Model 2581 3-Phase Monitor is designed to
continuously monitor 3-phase power lines for phase
loss, low voltage and phase reversal. The Model 2581
Monitor will detect phase loss on a loaded motor even
when regenerated voltage is present.
This device consists of a solid-state voltage and phaseangle sensing circuit, driving an electromechanical
relay. When correct voltage and phase rotation are
applied, the internal relay will energize. A fault
condition will de-energize the relay. When the fault is
corrected, the monitor will automatically reset .
The Model 2581 3-Phase Monitor does not require a
neutral connection and can be used with Wye or Delta
configured systems. Low voltage trip point is factory
set at 10% below nominal. An LED indicator is provided
for system troubleshooting.
TYPICAL APPLICATION
SPECIFICATIONS
Model 2581-208 2581-220 2581-240 2581-480
Nominal Voltage (phase to phase) 208VAC 220VAC 240VAC 480VAC
Trip Point 189VAC 200VAC 218VAC 436VAC
Trip Point Tolerance ± 2%
Frequency 60Hz
Power Consumption 1.5W 1.65W 1.86W 4.5W
Transient Protection 2500 VRMS for 10ms
Repeat Accuracy
Response Time 50ms (set or reset)
Dead Band Approx. 4%
Contact Rating SPDT 10 amps at 240VAC resistive
Expected Relay Life Mech:10 million operations
Elec: 100,000 operations at rated load
Operating Temperature - 20º to +131º F
Humidity Tolerance 97% w/o condensation
Enclosure Material ABS plastic
Agency Approvals Recognized to U.S. and Canadian
±0.1% (fixed conditions)
requirements under the Component
Recognition Program of Underwriters
Laboratories, Inc.
DIMENSIONS - 208 to 240V versions
11/2011
© 2011 TIME MARK CORPORATION
MODEL 2581
A
B
C
0.75"
.26“ dia.
typ.
.25" male
quick connect
2.53“
2.53“
1.38"
TIME MARK is a division of
3-Phase Monitor
READ ALL INSTRUCTIONS BEFORE INSTALLING, OPERATING OR SERVICING THIS DEVICE.
KEEP THIS DATA SHEET FOR FUTURE REFERENCE.
GENERAL SAFETY
POTENTIALLY HAZARDOUS VOLTAGES ARE PRESENT AT THE TERMINALS OF THE MODEL 2581.
ALL ELECTRICAL POWER SHOULD BE REMOVED WHEN CONNECTING OR DISCONNECTING WIRING.
THIS DEVICE SHOULD BE INSTALLED AND SERVICED BY QUALIFIED PERSONNEL.
Installation Instructions
INSTALLATION
Mount the Model 2581 3-Phase Monitor on a flat
surface, in a well ventilated area. It should be fastened
in position with a 1/4" bolt, washer and nut (not
included), through the center mounting hole on the unit.
Use 1/4" quick disconnect lugs, or an equivalent, to
connect the 3-phase power to the terminals marked A,
B and C.
Connect the control circuit to the terminals with the
contact markings. A standard wiring diagram is shown
in the TYPICAL APPLICATION drawing.
If the contact does not transfer (LED indicator-On),
check that all phases are present and of the correct
voltage.
If the contact still does not transfer, remove power and
reverse any two of the three phase wires (phase
rotation is reversed). Re-apply power. The contact
should transfer to provide a signal path between
terminals.
TROUBLESHOOTING
Should the Model 2581 Monitor fail to operate properly,
check that all three voltages are present, and are of the
correct voltage level and phase rotation (a Time Mark
Model 108A or 108B Phase Sequence Detector should
be used to verify phase rotation). Check all fuses and
verify that all wiring connections are correct. If
problems persist, contact your local Time Mark
Distributor or the factory for assistance (Monday-Friday,
8 a.m. to 5 p.m. CST).
PIN DIAGRAM
DIMENSIONS - 480V version
WARRANTY
This product is warranted to be free from defects in
materials and workmanship, and is covered by our
exclusive 5-year Unconditional Warranty. Should this
device fail to operate for any reason, we will repair it for
five years from the date of manufacture. For complete
warranty details, see the Terms and Conditions of Sales
page in the front section of the Time Mark catalog or
contact Time Mark at 1-800-862-2875.
Doc No. 87A459 12/00
© 2000 TIME MARK CORPORATION
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